Biostratigraphy of the Hojedk Formation in the Kale-shur region, South-West Tabas based on Plant Macrofossils and Analysis of Paleoclimate

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MEHDIZADEH AKRAM; VAEZ JAVADI FATEMEH; ASHOURI ALIREZA; GHADERI ABBAS

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Journal: KHARAZMI JOURNAL OF EARTH SCIENCES (JOURNAL OF SCIENCE (KHARAZMI UNIVERSITY)) Year:2019 | Volume:4 | Issue:2 Page(s): 213-240

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Title

Biostratigraphy of the Hojedk Formation in the Kale-shur region, South-West Tabas based on Plant Macrofossils and Analysis of Paleoclimate

Author(s)

MEHDIZADEH AKRAM | VAEZ JAVADI FATEMEH | ASHOURI ALIREZA | GHADERI ABBAS | Issue Writer Certificate

Keywords

Plant macrofossil

Biostratigraphy

Hojedk Formation

Jurassic

Tabas

Abstract

The Hojdek Formation in the Kale-shur area consists of alternation of fine quartz arenitic-arkosic sandstones with dark gray to green shales and coal seams. This formation includes relatively well-preserved Plant macrofossils which are studied here for the first time. 15 species of 9 genera belong to different orders such as Equisetales, Filicales, Sycadales and Pinales have been determined in this study. Based on these species, one biozone called Nilssonia bozorga-Coniopteris hymenophylloides Assemblage zone and two subzones in ascending order called Klukia exilis Taxon Range zone (I) and Ferizianopteris undulata-Equisetites sp. cf. E. columnaris Interval zone (II) were recognized in this section. These biozones in the study area are comparable with the correspondent biozones of the Middle Jurassic interval in the Tabas area. Thus, the Coniopteris hymenophylloides-Klukia exilis Assemblage zone is proposed as a widespread biozone for the Tabas area during the Middle Jurassic. According to occurrence of the index fossils such as Coniopteris hymenophylloides and Klukia exilix the age of Aalenian-Bajocian is considered for this assemblage. Analytical studies reveals the Filicales, Cycadales, Pinales and Equisetales respectively with relative abundance of 48. 08%, 32. 69%, 15. 38% and 3. 85% were the most plentiful orders in the Middle Jurassic succession of the Kale-shur area. In addition, Nilssonia, Podozamites, Ferizianopteris and Lobifolia were the most abundant genera with 32. 69%, 15. 38%, 11. 54% and 11. 54% abundance in the region. The relative abundance of Filicales and Cycadales established a humid sub-tropical climate for this region.

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APA: Copy

MEHDIZADEH, AKRAM, VAEZ JAVADI, FATEMEH, ASHOURI, ALIREZA, & GHADERI, ABBAS. (2019). Biostratigraphy of the Hojedk Formation in the Kale-shur region, South-West Tabas based on Plant Macrofossils and Analysis of Paleoclimate. KHARAZMI JOURNAL OF EARTH SCIENCES (JOURNAL OF SCIENCE (KHARAZMI UNIVERSITY)), 4(2 ), 213-240. SID. https://sid.ir/paper/382289/en

Vancouver: Copy

MEHDIZADEH AKRAM, VAEZ JAVADI FATEMEH, ASHOURI ALIREZA, GHADERI ABBAS. Biostratigraphy of the Hojedk Formation in the Kale-shur region, South-West Tabas based on Plant Macrofossils and Analysis of Paleoclimate. KHARAZMI JOURNAL OF EARTH SCIENCES (JOURNAL OF SCIENCE (KHARAZMI UNIVERSITY))[Internet]. 2019;4(2 ):213-240. Available from: https://sid.ir/paper/382289/en

IEEE: Copy

AKRAM MEHDIZADEH, FATEMEH VAEZ JAVADI, ALIREZA ASHOURI, and ABBAS GHADERI, “Biostratigraphy of the Hojedk Formation in the Kale-shur region, South-West Tabas based on Plant Macrofossils and Analysis of Paleoclimate,” KHARAZMI JOURNAL OF EARTH SCIENCES (JOURNAL OF SCIENCE (KHARAZMI UNIVERSITY)), vol. 4, no. 2 , pp. 213–240, 2019, [Online]. Available: https://sid.ir/paper/382289/en

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